/*
	Copyright (c) 2008, Grant Jones <grant@podtronics.com>.
	All rights reserved.

	Redistribution and use in source and binary forms, with or
	without modification, are permitted provided that the following
	conditions are met:

		Redistributions of source code must retain the above copyright
		notice, this list of conditions and the following disclaimer.
		
		Redistributions in binary form must reproduce the above copyright
		notice, this list of conditions and the following disclaimer in
		the documentation and/or other materials provided with the
		distribution.
		
		Neither the name of the gxjones.com nor the names of its
		contributors may be used to endorse or promote products derived
		from this software without specific prior written permission.
	
	THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
	"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
	LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
	FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
	COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
	INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
	(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
	SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
	STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
	ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
	OF THE POSSIBILITY OF SUCH DAMAGE.
	
	http://www.opensource.org/licenses/bsd-license.php
*/

/*
 *  edb_msg_expr.h
 *  scatterd
 *
 *  Created by Grant Jones on 3/4/08.
 *
 */

#ifndef EDB_MSG_EXPR_H
#define EDB_MSG_EXPR_H

/*!
	@function edb_numeric_value
	@abstract converts string to double if looks like a number
	@discussion 
	@param value
	@param num_value the resulting number
	@result 1 if the number was converted; 0 otherwise
*/
int edb_numeric_value( Token *value, double *num_value );

/*!
	@function edb_domain_eval
	@abstract evaluates where_expr using item_attrs
	@discussion
	@param where_expr
	@param item_attrs
*/
int edb_domain_eval( Expr *where_expr, AttrList *item_attrs );


/*!
	@function edbExpr
	@abstract the parser creates expression's via this function
	@discussion
	@param ctx Current parsing context
	@param op expression opcode
	@param pLeft left operand
	@param pRight right operand
	@param pToken Argument token
*/
Expr *edbExpr( edbParseContext *ctx, int op, Expr *pLeft, Expr *pRight, const Token *pToken );

/*!
	@function edbExpr
	@abstract the parser creates a function call via this function
	@discussion
	@param ctx Current parsing context
	@param name Function name
	@param args Function arguments
*/
Expr *edbExprFunction( edbParseContext *ctx, Token *name, AttrList *args );

#endif


